Move search indexing/re-indexing to the sysadmin section

OME-DCO-1.1-Signed-off-by: Sebastien Besson <seb.besson@gmail.com> (github: sbesson)
Improve re-indexing title style and add sub-titles

OME-DCO-1.1-Signed-off-by: Sebastien Besson <seb.besson@gmail.com> (github: sbesson)
Add table for re-indexing time of production servers

OME-DCO-1.1-Signed-off-by: Sebastien Besson <seb.besson@gmail.com> (github: sbesson)
re-indexation -> re-indexing

OME-DCO-1.1-Signed-off-by: Sebastien Besson <seb.besson@gmail.com> (github: sbesson)
merge dev_5_0 -D org: PR 819 (12311 auto memory docs)
merge dev_5_0 -D org: PR 820 (OMERO Developer doc tidying)
merge dev_5_0 -D org: PR 826 (Search page tidying up)
merge dev_5_0 -D org

Repository: openmicroscopy/ome-documentation
Updating c858dcf..3846667
Merged PRs (fast-forward):
  # PR 821 hflynn 'Schema links'
  # PR 818 bpindelski 'Add LDAP error message explanation. (rebased onto dev_5_0)'
  # PR 813 ximenesuk 'Update DropBox documentation'
  # PR 811 will-moore 'Webgateway mip 5150'
  # PR 815 manics 'Remove mapannotations'
  # PR 804 hflynn 'Adding example server setup page '
  # PR 808 sbesson 'Travis fix'

Merged PRs:
  # PR 819 joshmoore '12311 auto memory docs'
  # PR 820 hflynn 'OMERO Developer doc tidying'
  # PR 826 sbesson 'Search page tidying up'

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